After having changed his yaj~nopavIta, the dvija who has studied the shruti of the bhR^igu-s and the a~Ngiras goes to the preceptor to unlock the great secret of the tantra. He recites the triShaptIya which is the foundation of all bIja-s and in the morning recites the sUkta of the maitrAvaruNi beginning with “prAtar agniM pratar indraM…”. He then invokes the uShA-s as ordained in the tradition of the atharvan-s and performs an Achamana. Then he invokes rAtrI. Having done this he prepares for the worship of the glorious kubjIshana who is in the embrace of mahA-prachaNDa-kubjikA-pratya~NgirA with the highly secret mantra known as the raudra-atharvashiras, the hidden secret crest of nIlarudra, only passed by the anugraha of shiva to the student. He who knows this mantra is considered the master of the atharvan lore. His preceptor then unfolds before him the two supreme chakra-s known as the mahA-kubjIshAna maNDala, which is more complex in its construction than even the shrI-chakra, and the mahA-pratya~NgirA chakra.

Then the preceptor asks him to recite the kubjikA sUkta: shanno devI…abhi sravantu naH ||

Then he gives him the mantra weapon with which he battles abhichAra: chakShuSho hete manaso hete brahmaNo hete tapasash-cha hete ||
He also gives him the brahmaNa parimara mantra for the same purpose.
Then he gives him the para-kAya-praveshaNa mantra of the bhR^igu-s: taM tvA prapadye taM tvA pravishAmi sarvaguH sarva-puruShaH sarvAtmA sarva-tanUH saha yanme .asti tena ||
If appropriately initiated he can even animate a dreadful vetAla with this mantra.
Then he gives him the mantra of atharvaNa-bhadra-kAlI: kAlI karAlI cha manojavA cha sulohitA yA cha sudhUmravarNA |
sphuli~NginI vishvaruchI cha devI lelAyamAnA ||

Then he gives him the pUrNa-dIkSha with all the pratya~NgirA mantra-s at pinnacle including the 9-syllabled mantra siddhilakShmI and the deva nyAsa.

[While not imparted to brAhmaNa-s today, the final dIkSha in this series technically is the cremation ground ritual along with the dUtI. One should impart to the dUtI the secret nyAsa and take a war drum and go to the shmashAna. There with the crematory fire one makes oblations to pratya~NgirA with atharvanic mantra-s. Then facing west he and the dUtI draw the pratya~NgirA bhairava-chakra of the 8 special bhairava-s of this system, with avicephalic and therocephalic forms. In the middle they install pratya~NgirA and then enjoying the high rati of maithuna they invoke the great goddess with her secret mantra with the 4 special bhakti-s. Then he recites pratya~NgirA sUkta. With this he becomes the master of the pratya~NgirA lore — even if dhUmAvatI or bagalAmukhI were deployed against him he will back-hurl them.]